Nuclear Decommissioning Trust Funds (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds

	Successor
	June 30, 2024								December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Cash equivalents	$	13	$	—	$	—	$	13	$	9	$	—	$	—	$	9
Equity securities	498		636		56		1,078		491		575		53		1,013
Debt securities	600		3		5		598		570		10		1		579
Receivables (payables), net	(30)		—		—		(30)		(26)		—		—		(26)
NDT funds	$	1,081	$	639	$	61	$	1,659	$	1,044	$	585	$	54	$	1,575

Summary of Available-for-Sale Debt Securities with Unrealized Losses

The aggregate related fair value of available-for-sale debt securities with unrealized losses as of June 30, 2024 (Successor) were:

	Fair Value		Unrealized Losses
Corporate debt securities	$	78	$	(1)
Municipal debt securities	64		(1)
U.S. Government debt securities	183		(3)
Total debt securities in unrealized loss position	$	325	$	(5)

Securities in an unrealized loss position for a duration of one year or longer as of June 30, 2024 (Successor):

	Fair Value		Unrealized Losses
Municipal debt securities	$	49	$	(1)
U.S. Government debt securities	105		(2)
Total debt securities in unrealized loss position for one year or longer (a)	$	154	$	(3)

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(a)Excludes corporate debt securities which, in the aggregate, had a fair value of $23 million, as the unrealized losses were non-material.

Summary of Maturities for Available-for-sale Debt Securities

The contractual maturities for available-for-sale debt securities presented on the Consolidated Balance Sheets were:

	Successor
	June 30, 2024		December 31, 2023
Maturities within one year	$	75	$	105
Maturities within two to five years	177		194
Maturities thereafter	346		280
Debt securities, fair value	$	598	$	579

Summary of Maturities for Available-for-sale Debt Securities

The sales proceeds, gains, and losses for available-for-sale debt securities for the periods were:

	Successor				Predecessor		Successor				Predecessor
	Three Months Ended June 30, 2024		May 18 through June 30, 2023		April 1 through May 17, 2023		Six Months Ended June 30, 2024		May 18 through June 30, 2023		January 1 through May 17, 2023
Sales proceeds of NDT funds investments (a)	$	535	$	271	$	243	$	1,034	$	271	$	839
Gross realized gains	2		—		2		5		—		7
Gross realized losses	(3)		(2)		(2)		(6)		(2)		(12)

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(a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.